<?php
/**
 * Created by PhpStorm.
 * User: silvery
 * Date: 2016/9/28
 * Time: 18:13
 */
header(`Content-type:text/htmi;charset=utf-8`);
$name='小明';
$score=78;
if(is_int($score)|| is_float($score))
{
    if ($score >= 90 && $score <= 100) {
        $str = 'A级';
    } else
        if ($score >= 80 && $score < 90) {
        $str = 'B级';
    } else
            if ($score >= 70 && $score < 80) {
        $str = 'C级';
    } else
                if ($score >= 60 && $score < 70) {
        $str = 'D级';
    } else
                    if ($score >= 0 && $score < 60) {
        $str = 'E级';
    } else {
        $str = '学生成绩范围在0~100！';
    }
}
    else{$str ='输入的学生成绩不是数值！';
}
echo"<h2>学生成绩等级</h2><p>学生姓名：".$name."<p>学生分数：".$score."分<p>成绩等级：".$str;